A kind of in-furnace swirl fly ash reburning device

Abstract

The present invention relates to the technical field of boiler environmental emission, and is a swirl fly ash reburning device in a furnace, comprising: a cylinder and a secondary air device, the air inlet of the secondary air device is sealedly connected to the air outlet of the cylinder, the air inlet of the cylinder is sealedly connected to the air outlet of a slag condensing pipe, and blades are arranged in the cylinder, and the blades form an angle with the flow direction of the fly ash coming out of the slag condensing pipe. This solution effectively solves the problem of low desulfurization efficiency in the furnace and improves the efficiency of desulfurization and denitrification in the furnace; on the other hand, the secondary air is evenly mixed with the fly ash, which is conducive to the reburning of the fly ash, and the entire structure is simulated by fluid analysis software, and the actual application effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of boiler environmental emission, and in particular to an in-furnace swirl fly ash reburning device. Background Art

[0002] Due to the national requirements for the emission of sulfur dioxide and nitrogen oxides in boiler tail flue gas, existing boilers generally take corresponding measures to reduce sulfur and nitrogen. As the national environmental protection indicators for pollutant emissions become increasingly stringent, the requirements for environmental protection measures such as desulfurization and denitrification are also increasing.

[0003] At present, the most widely used method is to carry out environmental protection treatment of flue gas after combustion. According to the layout location, it is mainly divided into inside the furnace and outside the furnace. However, the existing solution of desulfurization and denitrification inside the furnace is not efficient, and the environmental protection cost of desulfurization and denitrification outside the furnace is relatively high. In summary, it is urgent to solve the above-mentioned technical solution of efficient and low-cost environmental protection treatment of tail gas. Summary of the invention

[0004] The present invention provides a furnace swirl fly ash reburning device, which solves the above-mentioned technical problem of low furnace desulfurization efficiency.

[0005] In order to solve the above technical problems, the present invention provides an in-furnace swirl fly ash reburning device, comprising: a cylinder and a secondary air device, the air inlet of the secondary air device is sealedly connected to the air outlet of the cylinder, the air inlet of the cylinder is sealedly connected to the air outlet of a slag coagulation pipe, blades are provided in the cylinder, and the blades form an angle with the flow direction of the fly ash coming out of the slag coagulation pipe.

[0006] Optionally, a central axis is provided in the cylinder, the root of the blade is welded to the central axis, and the edge of the blade is in contact with the inner wall of the cylinder.

[0007] Optionally, the blade is a fan-shaped flat plate, a narrow side of the fan-shaped flat plate is welded to the central axis, and a wide side abuts against the inner wall of the cylinder.

[0008] Optionally, a plurality of blades are symmetrically distributed in a ring around the central axis to form a smoke mixing layer, and a gap is left between two adjacent blades.

[0009] Optionally, a plurality of the smoke-passing mixed layers are arranged longitudinally along the central axis, and a gap between two adjacent smoke-passing layers is staggered longitudinally.

[0010] Optionally, the blades are spiral rising blades, and the edges of the spiral rising blades are welded to the inner wall of the cylinder.

[0011] Optionally, the blade is made of steel plate.

[0012] Optionally, the air inlet of the slag condensing pipe is sealedly connected to the air outlet of the combustion chamber behind the boiler furnace, and a desulfurization and denitrification reactant injection device is provided in the combustion chamber behind the boiler furnace.

[0013] Optionally, two air inlets are provided below the cylinder, one of which is sealedly connected to the air outlet of the slag condensation pipe, and the other is connected to the atmosphere.

[0014] Optionally, the blades form an angle with the flow direction of the fly ash coming out of the slag condensation pipe, and a plurality of the blades are welded on the inner wall in a star-shaped dotted fragmented form and are spirally ascending along the axial direction of the cylinder.

[0015] Beneficial effect: The present invention provides a swirl fly ash reburning device in a furnace, comprising: a cylinder and a secondary air device, the air inlet of the secondary air device is sealed and connected to the air outlet of the cylinder, the air inlet of the cylinder is sealed and connected to the air outlet of the slag condensation pipe, and blades are arranged in the cylinder, and the blades form an angle with the flow direction of the fly ash coming out of the slag condensation pipe. This solution effectively solves the problem of low desulfurization efficiency in the furnace and improves the efficiency of desulfurization and denitrification in the furnace; on the other hand, the secondary air and fly ash are mixed evenly, which is conducive to the reburning of fly ash, and the whole structure has been simulated by fluid analysis software, and the actual application effect is good.

[0016] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 This is a schematic structural diagram of a first embodiment of a swirl fly ash reburning device in a furnace according to the present invention;

[0019] Figure 2 Bit Figure 1 A top view of

[0020] Figure 3 This is a structural schematic diagram of a second embodiment of the in-furnace swirl fly ash reburning device of the present invention;

[0021] Figure 4 It is a structural schematic diagram of the third embodiment of the in-furnace swirl fly ash reburning device of the present invention.

[0022] Description of reference numerals: central axis 1, blades 2, cylinder 3, slag condensation pipe 4. DETAILED DESCRIPTION

[0023] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0024] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] Embodiment 1:

[0027] like Figure 1 and Figure 2 As shown, the present invention provides an in-furnace swirl fly ash reburning device, comprising: a cylinder 3 and a secondary air device, the air inlet of the secondary air device is sealed and connected to the air outlet of the cylinder 3, the air inlet of the cylinder 3 is sealed and connected to the air outlet of the slag condensing pipe 4, and blades 2 are arranged in the cylinder 3, and the blades 2 form an angle with the flow direction of the fly ash coming out of the slag condensing pipe 4. The hot flue gas in the furnace carries unburned fly ash and coal particles, passes through the slag condensing pipe 4, and enters the in-furnace swirl fly ash reburning device for reburning. This solution effectively solves the problem of low desulfurization efficiency in the furnace and improves the efficiency of desulfurization and denitrification in the furnace; on the other hand, the secondary air is evenly mixed with the fly ash, which is conducive to the reburning of the fly ash, and the entire structure has been simulated by fluid analysis software, and the actual application effect is good.

[0028] Among them, the secondary air device is not shown in the figure. The secondary air device is an ordinary fan installed at the end air outlet of the cylinder 3. Under the negative pressure of the fan, the flue gas and fly ash in the furnace pass through the slag condensation pipe 4 and reach the cylinder 3. Under the action of the blades 2 in the cylinder 3, the flue gas is further mixed. Since the flue gas temperature in the cylinder 3 here is between 800-900℃, it is beneficial to the action of the desulfurization and denitrification reactants, and can allow the fly ash to reburn, thereby improving the burnout rate of coal.

[0029] In an optional solution, a central axis 1 is provided in the cylinder 3, the root of the blade 2 is welded to the central axis 1, and the edge of the blade 2 abuts against the inner wall of the cylinder 3. On the cylinder 3 and the slag condensation pipe 4, the central axis 1 is located at the center of the cylinder 3, and the central axis 1 can be fixed by welding with the inner wall of the cylinder 3 through reinforcing ribs, or by welding or abutting the blade 2 with the inner wall of the cylinder 3.

[0030] In an optional solution, the blade 2 is a fan-shaped flat plate, the narrow side of the fan-shaped flat plate is welded to the central axis 1, and the wide side is in contact with the inner wall of the cylinder 3. The fan-shaped flat plate has an inclined angle with the longitudinal direction of the central axis 1 to facilitate the mixing of the flue gas.

[0031] In an optional solution, a plurality of blades 2 are symmetrically distributed around the central axis 1 to form a smoke mixing layer, and a gap is left between two adjacent blades 2. The mixed smoke passes through the gap, and the blades 2 have a certain buffering effect on the mixed smoke, making the mixing more uniform.

[0032] In an optional solution, multiple smoke mixing layers are arranged longitudinally along the central axis 1, and the gaps between two adjacent smoke mixing layers are staggered longitudinally. Multiple smoke mixing layers lengthen the flue path, making the smoke, fly ash, etc. mixed more evenly.

[0033] Embodiment 2:

[0034] like Figure 3 As shown, the in-furnace swirl fly ash reburning device comprises: a barrel 3 and a secondary air device, the air inlet of the secondary air device is sealed and connected to the air outlet of the barrel 3, the air inlet of the barrel 3 is sealed and connected to the air outlet of the slag condensing pipe 4, a blade 2 is arranged in the barrel 3, the blade 2 forms an angle with the flow direction of the fly ash coming out of the slag condensing pipe 4, the blade 2 is a spiral rising blade, and the edge of the spiral rising blade is welded to the inner wall of the barrel 3. The spiral rising blade is an integrated structure, which is easy to install and has a good effect of fully mixing and uniformly mixing the mixed flue gas.

[0035] In an optional solution, the blade 2 is made of a steel plate. The stainless steel plate is easy to weld with the stainless steel cylinder 3 and has high strength and long service life.

[0036] In an optional solution, the air inlet of the slag condensation pipe 4 is sealed and connected to the air outlet of the combustion chamber behind the furnace of the boiler, and a desulfurization and denitration reactant injection device is provided in the combustion chamber behind the furnace of the boiler. The in-furnace swirl fly ash reburning device is arranged at the upper part of the combustion chamber behind the furnace of the boiler, below the position of the recondensation pipe 4, and a secondary air device is also provided on its upper part. There is a desulfurization and denitration reactant injection device in the furnace.

[0037] In an optional solution, two air inlets are provided below the cylinder 3, one of which is sealed and connected to the air outlet of the slag condensation pipe 4, and the other is connected to the atmosphere. The blades 2 in the in-furnace swirl fly ash reburning device play a role in mixing the flue gas, fly ash, secondary air, and desulfurization and denitration reactants evenly. That is, the in-furnace swirl fly ash reburning device is added to the combustion chamber behind the furnace, so that the flue gas and the desulfurization and denitration agent are evenly mixed, and the fly ash and the oxygen in the secondary air are evenly mixed, so as to achieve a good desulfurization and denitration effect.

[0038] Embodiment three:

[0039] like Figure 4 As shown, the in-furnace swirl fly ash reburning device includes: a cylinder 3 and a secondary air device, the air inlet of the secondary air device is sealed and connected to the air outlet of the cylinder 3, the air inlet of the cylinder 3 is sealed and connected to the air outlet of the slag condensing pipe 4, and blades 2 are provided in the cylinder 3, and the blades 2 form an angle with the flow direction of the fly ash coming out of the slag condensing pipe 4. The blades 2 are dotted and fragmented blades, and a plurality of blades are sporadically welded on the inner wall and spirally ascend along the axial direction of the cylinder 3. The edges of the blades 2 are welded to the inner wall of the cylinder 3, which is easy to install and has a good and sufficient mixing effect on the mixed flue gas.

[0040] In an optional solution, the blade 2 is made of a steel plate. The stainless steel plate is easy to weld with the stainless steel cylinder 3 and has high strength and long service life.

[0041] In an optional solution, the air inlet of the slag condensation pipe 4 is sealed and connected to the air outlet of the combustion chamber behind the furnace of the boiler, and a desulfurization and denitration reactant injection device is provided in the combustion chamber behind the furnace of the boiler. The in-furnace swirl fly ash reburning device is arranged at the upper part of the combustion chamber behind the furnace of the boiler, below the position of the recondensation pipe 4, and a secondary air device is also provided on its upper part. There is a desulfurization and denitration reactant injection device in the furnace.

[0042] In an optional solution, two air inlets are provided below the cylinder 3, one of which is sealed and connected to the air outlet of the slag condensation pipe 4, and the other is connected to the atmosphere. The blades 2 in the in-furnace swirl fly ash reburning device play a role in mixing the flue gas, fly ash, secondary air, and desulfurization and denitration reactants evenly. That is, the in-furnace swirl fly ash reburning device is added to the combustion chamber behind the furnace, so that the flue gas and the desulfurization and denitration agent are evenly mixed, and the fly ash and the oxygen in the secondary air are evenly mixed, so as to achieve a good desulfurization and denitration effect.

[0043] Beneficial effects:

[0044] (1) Improve the efficiency of desulfurization and denitrification in the furnace.

[0045] (2) The secondary air is evenly mixed with the fly ash, which is conducive to the reburning of the fly ash.

[0046] (3) The structure was simulated by fluid analysis software with good results.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A swirl fly ash reburning device in a furnace, characterized in that: include: A cylinder and a secondary air device, wherein the air inlet of the secondary air device is sealedly connected to the air outlet of the cylinder, the air inlet of the cylinder is sealedly connected to the air outlet of the slag condensation pipe, and blades are arranged in the cylinder, and the blades form an angle with the flow direction of the fly ash coming out of the slag condensation pipe; Wherein, a central axis is provided in the cylinder, the root of the blade is welded to the central axis, and the edge of the blade abuts against the inner wall of the cylinder; Wherein, the blade is a fan-shaped flat plate, the narrow side of the fan-shaped flat plate is welded to the central axis, and the wide side abuts against the inner wall of the cylinder; Wherein, the blades are spiral rising blades, and the edges of the spiral rising blades are welded to the inner wall of the cylinder.

2. The in-furnace swirl fly ash reburning device according to claim 1, characterized in that: The plurality of blades are symmetrically distributed around the central axis in a ring shape to form a smoke mixing layer, and a gap is left between two adjacent blades.

3. The in-furnace swirl fly ash reburning device according to claim 2, characterized in that: The plurality of smoke-passing mixed layers are arranged longitudinally along the central axis, and the gaps between two adjacent smoke-passing layers are staggered longitudinally.

4. The in-furnace swirl fly ash reburning device according to claim 1, characterized in that: The material of the blade is steel plate.

5. The in-furnace swirl fly ash reburning device according to claim 1, characterized in that: The air inlet of the slag condensing pipe is sealedly connected to the air outlet of the combustion chamber behind the boiler furnace, and a desulfurization and denitration reactant injection device is arranged in the combustion chamber behind the boiler furnace.

6. The in-furnace swirl fly ash reburning device according to claim 1 or 5, characterized in that: Two air inlets are arranged below the cylinder, one of which is sealedly connected to the air outlet of the slag condensation pipe, and the other is connected to the atmosphere.

7. The in-furnace swirl fly ash reburning device according to claim 1, characterized in that: The blades are at an angle to the flow direction of the fly ash coming out of the slag condensation pipe, and a plurality of the blades are welded on the inner wall in a star-shaped dotted fragmented form and are spirally ascending along the axial direction of the cylinder.

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